Demountable cutter unit



` May 29, 1945.

w. owEN DEMOUNTABLE CUTTER UNIT Filed Jan. 28, 1944 3mm/wrom )VIL/.mm Owe/v Patented May 29, 1945 Y n 2,377,009 y DEMOUNTABLE CUTTER UNIT William Owen, Pittsburgh, Pa., assigner to littsi burgh Plate Glass Company, Allegheny County, f

Pa., a corporation of Pennsylvania Appia-ation` January 2s, 1944, serial No. 520,032

' i claims. (ci. 33-32) This invention relates to cutting apparatus and y it has particular relation to a glass cutting unit adapted to ybe attached to mechanically operated apparatus for cutting glass.

One object of the invention is to provide an improved cutter unit,` the parts of which are demountable and replaceable with minimium de lay in operation.

Another object of the invention is to provide improved cutter units the parts of which are adapted to Ibe vmounted interchangeably or reout of operative position in a multiple cutter type of machine.

An apparatus, for operating the type of cutter units described and shown herein, is shown in my copending application Serial No. 520,031, for Double-acting glass cutter, led on even date herewith.

In one form of the invention a cutter unit is composed of a suitable casing partially open on one side and in which a spring-compressed cutter stemv is slidably mounted. A block is abutted against the upper end portion ofthe casing and a bolt is threaded through the block in such position that its lower end bears upon the upper end of a plug which is slidably mounted in the stem and against which a spring is compressed. Downward movement of the stem is limited by suitable stops to gauge the cutting position of the stem.

In the drawing: y

Fig. 1 is a partial front elevation of a cutter unit with portions thereof broken away and shown in vertical section; Fig. 2 is a vertical sectiontaken substantially along the line II--II of Fig. 1; and Fig. 3 is a partial plan of the unit shown in Fig. 1 with an upper element shown inhorizontal section.

In practicing the invention there is provided a cutter unit I0, which includes vertical parallel side plates I2 Ibolted, as indicated at I4, upon opposite sides of an upright spacer bar I5 upon which rearwardly extending clamping arms or flanges I6 are welded. An upper guide or abutment plate I1 is welded between the plates I2 and upon the upper end of the bar I5, and is formed with a slot I9 leading from its central portion outwardly through the plate edge adjacent the open side of the casing. It will be noted that the arms I6 project rearwardly and the plates I2 project forwardly with respect to the bar I5.

A hollow stem 2B of rectangular cross-section fits at opposite sides snugly between the side plates I9. The other two opposite sides iit 'between the spacer bar I5 and a pair of rivets 2|, thelatter of which are rigidly' mounted in the plates I2 at positions equally spacedirom the bar I5. The hollow stem V20 is thus` slidably guided 4between the side platesI'Zand'is further guided by the bar I5 and rivets`2l. A'handle 24 rigidly secured' tothe upper end of the' stem' 20 normally rests" against the upper' spacer rivet 2'I which limits downward movement of the stem as it is guided vbetween the side plates. A plug 25 is slidably mountedin the hollow stem l 2U and a compression spring 26 inside the stem presses at its upper end against the lower end of the plug. At its lower end, the spring abuts against the inner 'bottom wall of the stem. The upper end of the plug 25 has an indentation 21 formed therein to receive a lower pointed end of a b'olt 30, which is screw-threaded through a block 3l and which is normally disposed coaxially with respect to the stem 20. the slot I9 and can be adjusted in the block to impose whatever tension that may be desired in the coil spring 26. The bolt and plug can be removed as a unit and snapped back into place between the side plates, as indicated in the broken lines of Fig. 2. After the bolt 30 has been re-` moved the stem 20 can also be removed by raising it by its handle 24 and lifting it laterally from the casing.

'Ihe-lower vend of the stem 20 is provided with a wheel cutter 34 rotatably mounted upon the fbight portion of a resilient U-shaped pin 35, which is `removably sprung into openings 36 formed in the lower end of the stem. The cutter elements are thus readily demountable and the cutter wheel can be quickly replaced.

The pressure ofthe cutter wheel upon a sheet of glass to be cut is determined by the resist ance yieldably afforded by the coil spring 26 and this resistance can be varied by manipulating the bolt 30 in the manner specified. The cutter can be operated in the manner described in connection with a cutter-supporting carriage shown in my copending application referred to above.

Although only one form of the invention has been shown and described in detail, it will lbe apparent to those skilled in the art that the invention is not so limited, but that various changes can be made therein within the spirit of the invention and within the scope of the appended claims.

I claim:

1. A glass cutting unit comprising a guide, a hollow cutter stem slidable in the guide to a position of partial projection from one extremity The bolt ts in 2. A glass cutting unitl comprising a guide, a m

hollow stem slidable in said guide to a position of parti-a1 projection from one extremity thereof and the projecting portion of said stem having a glass cutting element thereon, means on the guide for limiting movement of the stem through l5 said extremity of the guide, a side portion of the guide adjacent the stem being open, a member mounted adjustably in the guide toward and -away from the stem and demountable laterally through the open portion of the guide, and a 20 spring compressed between the stem and said member and normally holding the cutter stem against said means.

3. A glass cutting unit comprising a guide, a

cutter stem slidable in said guide to a position 2;

of partial projection from one extremity thereof and the projecting portion of the stem having a glass cutting element thereon, stop means on the guide limiting movement of the stem through said extremity, a side portion of the guide adjacent the stem being open, a slotted abutment on i,

3o tween the abutment and spring.

the guide adjacent the extremity thereof opposite the projecting end of the stem, a bolt mountable later-ally through the slotted portion of the abutment, a block threaded on the bolt and normally resting against the inner side of said abutment, and a spring compressed between the stem and the end of the bolt and limited in expansion by the stop means and abutment.

2i. A glass cutting unit comprising a guide, a cutter stem slidable in said guide to a position of partial projection from one extremity thereof and the projecting portion of the stem having a glass cutting element thereon, a side portion of the guide adjacent the stem being open for reoeiving the stem in assembling the latter, said stem including a handle projecting laterally through the open side of the guide, stop means on the guide engageable with the handle to limit movement of the stem through said extremity of the guide, a slotted abutment on the guide adjacent the extremity thereof opposite the projecting end of the stem, a bolt mounted later-ally through the slotted portion of the abutment, a block threaded upon the bolt and normally resting against the inner side of the abutment, and a spring compressed between the stem rand the end of the bolt and limited in expansion by the stop means and the abutment, said bolt and block being demountably snapped into place be- WILLIAM OWEN. 

